What do you do when this stuff happens? Here's what you do:
-Your friend needs to buy you a new weed wacker, same brand, same type, end of story. Tell this to your friend. Be very matter-of-fact. No long explanation, no apology for asking for what is rightfully yours, just tell that person, I expect you to replace my weed wacker.
-BIL will not receive any more loans from you, and you tell him you expect the felt to be replaced by the end of the year. It sounds like he probably won't do it, but you need to get your point across that this is unacceptable.
-You don't loan out cd's anymore. Your BFF can check out a band for free on myspace, or she can download a few songs on itunes for a few bucks like everyone else. Alternatively she can bring a blank cd to your house and you can burn it for her, right there and then.
WHenever you have the inclination to lend money or items to someone, stop yourself and think. Sleep on it. Don't just make offers willy nilly. Sounds like you are a people pleaser, and you enjoy being the hero with the weed wacker, the money, the time to babysit, etc. Those people can survive without you. You need to start saying no, and stop offering.
Make the best of your new haircut and style it up real cute. Just because you were hair raped doesn't mean you have to sulk about it. I mean, it sucks, I'm not saying you shouldn't feel wronged, but enough is enough. Take back the control.